MTBE
City of Dorchester
MTBE was used as gasoline oxygenation additive to boost the octane number. In 2005, MTBE was replaced by ethanol as a gasoline additive. MTBE causes cancers in rats.
12
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 13 ppb
The EWG Health Guideline of 13 ppb for MTBE was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-07-05 | Q1826628001 | ND |
| 2018-07-05 | Q1826628010 | ND |
| 2019-08-13 | Q1954235002 | ND |
| 2019-08-13 | Q1954235004 | ND |
| 2020-10-15 | Q2040499003 | ND |
| 2020-11-23 | Q2046450001 | ND |
| 2021-09-20 | Q2125598003 | ND |
| 2021-12-13 | Q2134947004 | ND |
| 2022-06-29 | Q2218370001 | ND |
| 2022-10-19 | Q2231829003 | ND |
| 2023-08-23 | Q2335730001 | ND |
| 2023-11-13 | Q2348430001 | ND |